Lube-Tech PUBLISHED BY LUBE: THE EUROPEAN LUBRICANTS INDUSTRY MAGAZINE for the 50% sp3 steel disc in contact with the sp2 ). Figure 13. Addition of PFM1 to MoDTC, even further reduction of wear volume
2.3 DLC sp2 The sp2
;Cr doped; 0% hydrogen DLC ball is a higher friction surface than the 50% sp3
same 5W30 ACEA C3 oil, the sp2
;Cr doped; 0% hydrogen Ball - Steel Disc ; 40% hydrogen DLC ball. Using the
ball – steel disc arrangement had a coefficient of friction ≥0.12 at slow speeds (figure 14), compared to 0.11 for the 50% sp3 40% hydrogen ball – steel disc arrangement.
;Cr doped; 0% hydrogen DLC ;
).
No.110 page 5
At the end of test, the measured wear volume on the sp2 doped; 0% hydrogen DLC ball was 125,000 µm3 to <5000 µm3
ball also experienced higher wear (50,000 µm3 the steel disc in contact with the 50% sp3 (120,000 µm3
;Cr , compared
; 40% hydrogen DLC ball. The ;Cr doped; 0% hydrogen DLC ) compared to
; 40% hydrogen ball
MoDTC did not lead to any reduction in friction with the sp2
36% reduction in wear (32,000 µm3 counter-surface compared to the reference oil alone.
Glycerol mono-oleate, when used as the only friction modifier top-treated into the 5W30 ACEA C3 oil, gave the best performance in reducing both friction (0.115) and wear with the sp2
;Cr doped; 0% hydrogen DLC ball. Compared to the
reference oil, the oil containing GMO gave a 10% reduction in boundary friction and >10% in the mixed lubrication regime. GMO reduced the wear (11500µm3) on the sp2
;Cr doped;
0% hydrogen DLC ball by 90% and by 10% on the steel disc counter-face (45500 µm3
Including MoDTC in the GMO containing formulation resulted in a product which had friction and wear properties similar to the ACEA C3 reference oil, suggesting that MoDTC and GMO were counteracting each other (figure 16).
;Cr doped; 0% hydrogen DLC ball but still resulted in 65% increase in wear (230,000 µm3
) on the DLC ball. There was a ) observed on the steel disc
Figure 14. Stribeck Curves for sp2;Cr doped; 0% hydrogen DLC ball – steel disc The sp2
;Cr doped; 0% hydrogen DLC ball was also shown to be much less durable than the 50% sp3 be seen in figure 15.
; 40% hydrogen ball, as can
Figure 16. Addition of GMO to MoDTC, effect on wear volume sp2 DLC
Including PFM alone in the ACEA C3 engine oil resulted in higher friction than the reference oil and also higher wear on the sp2
;Cr doped; 0% hydrogen DLC ball, an increase of 40%. The wear on the steel disc counter-face was very similar to the reference oil without any additional FM added (figure 17).
Figure 15. Wear profiles for sp2
;Cr doped; 0% hydrogen DLC ball – steel disc LUBE MAGAZINE NO.139 JUNE 2017 37
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